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Патент USA US3023637

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March 6, 1962
L. J. HEPPNER
3,023,628
IMPACT TOOL
Filed Aug. 1, 1960
FIG?)
39
37
INVENTOR.‘
LEANDER J. HEPPNER
BY
J‘ £44.01
ATT'YS
hired tats
$6
1
3,023,628
Patented Mar. 6, 1962
2
FIG. 3 is a transverse section looking in the direction
3,023,628
EMPAQT T061.
Leander J. Heppner, 4914 W. Iiackson Blvd, Chicago, Ill.
of the arrows 3—-3 of FIG. 1.
‘
from a portable hand drill or the like.
14 and 16 to a thrust collar 17 having a ?ange 18 which
Referring now to the drawing, the improved tool accord
Filed Aug. 1, 1969, 5st‘. No. 46,458
ing to the present invention is referred to generally by
Ct the reference numeral 10, and includes an essentially
7 Claims. (Cl. 74—55)
cylindrical housing 11 enclosing a pair of'frame halves
This invention relates generally to impact tools, and
12 and 13, each of which is joined by countersunk screws
more particularly to an impact tool which can be powered
is guided within a ?ange 19 of the housing 11.
The impact tool according to the present invention is 10
The frame halves 12 and 13 are held in position within
characterized by a drive shaft turning in a support hous
the housing 11 by means of an annular closure 21 having
ing, and driving a train of bevel gears supported on a
an annular shoulder 22 which bears against one end of
frame enclosed within the support housing. The train
of bevel gears includes a pair of driven gears mounted
on co-axial shafts supported on the frame and turning in
opposite directions. The co-axial shafts are each pro
vided with an eccentric turning in opposite directions and
arranged within a yoke and reciprocating member con
neeted to a suitable device for retaining an impact tool
bit. A spring is maintained between the yoke and the
frame so as to cause the eccentrics to be in contact at all
times with the yoke. The frame supported within the
housing is provided at each end thereof with structures for
absorbing the shock occasioned by the reciprocating move
ment of the tool bit, and its impact against an object
worked upon by the tool.
The frame for supporting the driven bevel gears is com
posed of two halves, each of which supports one of the
bevel gears, these frame halves being adapted to be nested
within the housing. By the provision of the frame halves
it is possible to transmit the load on each eccentric into
its corresponding one of the frame halves and to elimi
nate substantially any bending stresses upon the shafts
supporting the driven bevel gear, and to eliminate sub
stantially any stresses upon the driven gears excepting
those occasioned by being driven from the driving gear.
With the foregoing considerations in mind, it is a prin
cipal object of this invention to provide an impact ma
chine tool capable of being driven by a portable hand
drill or the like.
Another object is to provide an impact tool compris
ing a bevel gear driving train consisting of a pair of
driven bevel gears adapted to turn an eccentric for im
parting reciprocating motion to a tool member, and to
mount each of the driven gears in a half frame which
can be readily assembled within a support housing.
Still another object is to provide an impact tool con
sisting of a pair of impact producing eccentrics, each of
said eccentrics being driven by a bevel gear in opposite
the housing 11. 'Countersunk screws 23 and 24 are tapped
into the annular closure 21 to hold the same to the hous
ing 11.
A driving shaft 26 adapted to be drivably connected to
any external power source such as the chuck of a portable
hand drill or the like, not shown, turns in a thrust bushing
27 supported in the ?ange 18 of the thrust collar 17.
The thrust bushing 27 has a ?ange 28 which bears against
a bevel gear 29 fast to the shaft 26 by means of a key 31.
A closure 32 encircles the shaft 26 and is held between
the shaft 26 and the ?ange 19 of the housing 11.
The driving bevel gear 29 drives bevel gears 33 and 34,
respectively mounted upon co-axial shafts 36 and 37.
Gear 33 is made fast to the shaft 36 by means of a key
38, and the shaft 36 is supported in a bearing bushing 39
mounted in the frame half 13. The shaft 36 also turns
in bushing 41 in turn held in an extension 42 of an inner
half frame 43 having a semi-cylindrical extension 44.
Gear 34 is fast to the shaft 37 by a key 46, and the
shaft 37 turns in a bushing 47 mounted in the frame half
12. The shaft 37 also turns in a bushing 48 supported in
an extension 49 of an inner frame half 51 mating with
the frame half 43. The frame half 51 has a semi-cylin
drical extension 52.
The two inner frame extensions 44 and 52 are each
threaded as at 53, and a collar 54 is threaded to the lower
end of the inner frame extensions 44 and 52. The inner
face of the collar 54 forms an abutment for a shock ab
sorbing spring 56 having its other end bottomed against
an annular seat 57 formed on the inside of the annular
closure 21.
The frame halves 12 and 13, together with the thrust
collar 17, are spaced from the housing ‘11 by means of a
resilient disk-like shock absorbing member 58. It will
be seen that the frame halves 12 and 13, the thrust mem
ber 17 and the inner frame halves 43 and 51 are thus
resiliently supported within the housing 11 in such a fash
Still another object comprehends the provision of a 50 ion that any impact forces against the inner frame will
not readily be transmitted into the housing 11.
pair of frames which can be nested within a housing, each
Structure is provided for imparting impact against a
of the frames supporting a driven bevel gear and an eccen
reciprocating
tool holder 59 having a threaded shank 61
tric driven thereby for imparting reciprocating motion to
which is threaded to a reciprocating member 62. The
a tool member.
tool holder 59 has a recess 63 therein for receiving any
Other objects and important features of the invention
suitable tool, not shown.
will be apparent from a study of the speci?cation follow
Structure is provided for giving reciprocating move
ing taken with the drawing, which together describe and
directions.
ment to the member 62 and tool holder 59 and accord
ingly the two co-axial shafts 36 and 37 are respectively
provided with cylindrical cam eccentrics 64 and 66.
the principles thereof. Other embodiments of the inven 60 These eccentrics turn within a yoke 67 having an opening
tion may be suggested to those having the bene?t of the
68 therein arranged to provide clearance for the eccen
teachings herein, and such other embodiments are intended
trics 64 and 66 as they turn, and having a semicircular
to be reserved especially as they fall within the scope and
illustrate a preferred embodiment of the invention and
what is now considered to be the best mode of practicing
spirit of the subjoined claims.
In the drawing:
FIG. 1 is a longitudinal sectional view through the im
proved impact tool of the present invention, certain parts
thereof being shown in elevation;
camming surface 69 contacted by the rotating eccentrics
65 64 and 66.
It may be noted that the shaft 36 supporting the eccen
tric 64 has an extension 71 therefrom, which is received
within a mating recess 72 on the inner end of the shaft 37
to provide for alignment of the two shafts 36 and 37.
FIG. 2 is an elevational view thereof, certain parts
being shown in section, said view looking in the direction 70 As seen more particularly in FIG. 2, the member 62 is
given reciprocating motion by the contra-rotating eccen
of the arrows 2.—2 of FIG. 1; and
tries 64 and 66, the upper limit of movement of the yoke
3,023,628
3
4
67 being shown in dotted outline. Clearance is afforded
for the yoke 67 in its upper limit of movement by forming
means positioned between said frame halves and said
housing for absorbing vibration incident the movement
a recess 73 in the driving gear 29.
3. In an impact tool, a housing including a powered
shaft turning within said housing, a pair ‘of frame halves
A spring 74 is arranged to bias the yoke 67 against the
eccentrics 64 and 66, and the spring 74 has one end there
of abutting the tool holder 59, its other end abutting
shoulders 76 and 77 formed respectively in the inner half
frames 43 and 51.
of said reciprocating member.
supported within said housing in confronting relationship,
a shaft in one frame half arranged co-axially with a shaft
in the other frame half, means for transmitting power
from said powered shaft to said last named shafts, an
eccentric mounted on each of said last named shafts, a
In operating the device according to the present inven
tion, the housing 11 must be held against rotation when
reciprocating member operatively connected with said
shaft 26 is driven. A suitable frame, not shown, may be
eccentrics and adapted to be driven reciprocatingly by
provided for holding the housing 11 to the frame of a
said
eccentrics, resilient means biased between said re
portable electric drill or the like, with which the device
ciprocating member and said frame halves for maintaining
of the present invention is adapted to be used. However,
15 said eccentrics in contact with said reciprocating member,
the housing 11 can be held in the hand of the operator.
resilient means biased between one end of said housing
When power is applied to the shaft 26, the driven bevel
and said frame halves, and additional resilient means posi
gears 33 and 34 rotate in opposite directions, eccentrics 64
tioned between said frame halves for absorbing vibration
and 66 turning in correlative directions. The rotation of
incident the movement of said reciprocating member.
the eccentrics 64 and 66 causes the member 62 to be
4. In an impact tool, a housing including a powered
reciprocated and when a tool is held in the tool holder 59,
shaft
turning within said housing, a pair of frame halves
a succession of repeated impact blows can be made against
supported within said housing in confronting relationship,
an object such as concrete, brick masonry or the like. By
reason of the shock absorbing spring 56 and the resilient
shock absorbing device 58, the impact will not be felt to
any appreciable extent by the operator.
The spring 74 is a “power” spring in that, upon being
compressed by upward movement of the member 62, its
stored-up force is added to the force of the contra-rotating
a shaft in one frame half arranged co-axially with a shaft
in the other frame half, said shafts meeting in end to end
relation at the longitudinal axis of said housing, a driving
bevel gear mounted on said powered shaft and driven
bevel gears coacting therewith mounted on said shafts
supported within said frame halves, an eccentric cylindri
cal cam mounted on the inner end of each of said last
cams or eccentrics 64-66 as they drive the member 62
named shafts, a reciprocating member operatively con
nected with said eccentrics and adapted to be driven re
to deliver an impact blow. Thus, by varying the strength
of the spring 74, the “hitting force” of the tool can be
varied, within the capacity of the driving motor, for either
heavy duty work, such as chiseling through concrete or
ciprocatingly by said eccentrics, said reciprocating mem
ber comprising a yoke having a semi-circular opening
within which said cylindrical cams are received to rotate
cutting a hole in a steel plate, or light duty work such as
in opposite directions, and resilient means biased between
said reciprocating member and said frame halves for
maintaining said eccentrics in contact with said recipro~
caulking. As shown, the structure of my improved im
pact tool readily admits of quick and easy change of the
spring 74- by merely unscrewing the tool holder 59 from
cating member.
the member 62.
Although but one speci?c embodiment of this invention
has been herein shown and described, it will be understood
that details of the construction shown may be altered or
5. In an impact tool, a housing including a powered
shaft turning within said housing, a pair of frame halves
supported within said housing in confronting relationship,
a shaft in one frame half arranged co-axially with a shaft
omitted without departing from the spirit of the invention
as de?ned by the following claims.
in the other frame half, said shafts meeting in end to end
relation at the longitudinal axis of said housing, a driving
bevel gear mounted on said powered shaft and driven
bevel gears coacting therewith mounted on said shafts
supported within said frame halves, inner frame halves
I claim:
1. In an impact tool, a housing including a powered
shaft turning within said housing, a pair of frame halves
supported within said housing in confronting relationship,
having longitudinal extensions therefrom for supporting
a shaft in one frame half arranged co-axially with a shaft
the inner ends of said last named shafts, an eccentric
cylindrical cam mounted on each of said last named shafts
in the other frame half, means for transmitting power
from said powered shaft to said last named shafts, an eccentric cylindrical cam mounted on each of said last
named shafts, said cams being in face to face relation and
one ‘of said shafts having an axial extension rotatively
received in an axial recess in the adjacent end of the other
between said extensions, a reciprocating member slidably
mounted between said extensions to be laterally supported
thereby and including a yoke surrounding said eccentrics
and adapted to be driven reciprocatingly by said eccen
trics, and resilient means biased between said reciprocating
member and said inner frame halves for maintaining said
eccentrics in contact with said reciprocating member.
6. In an impact tool, a housing including a powered
shaft turning within said housing, a pair of frame halves
shaft, a reciprocating member operatively connected with
said eccentrics and adapted to be driven reciprocatingly by
said eccentrics, and resilient means biased between said
reciprocating member and said inner frame halves for
maintaining said eccentrics in contact with said reciprocat
ing member.
2. In an impact tool, a housing including a powered
shaft turning within said housing, a pair of frame halves
supported within said housing in confronting relationship,
60
supported within said housing in confronting relationship,
a shaft in one frame half arranged co-axially with a shaft
in the other frame half, a driving bevel gear mounted on
said powered shaft and driven bevel gears coacting there
with mounted on said shafts supported within said frame
a shaft in one frame half arranged co-axially with a shaft
in the other frame half, a driving bevel gear mounted on 65 halves, an eccentric mounted on each of said last named
shafts, a reciprocating member including a yoke thereon
said powered shaft and driven bevel gears coacting there
with mounted on the shafts supported within said frame
halves, an eccentric mounted on each of said last named
surrounding said eccentrics and adapted to be driven
reciprocatingly by said eccentrics, resilient means biased
between said reciprocating member and said frame halves
shafts, a reciprocating member operatively connected with
said eccentrics and adapted to be driven reciprocatingly by 70 for maintaining said eccentrics in contact with said re
said eccentrics, resilient means biased between said re
ciprocating member, resilient means biased between one
ciprocating member and said inner frame halves for main
taining said eccentrics in contact with said reciprocating
resilient means positioned between said frame halves and
member, resilient means biased between one end of said
housing and said frame halves, and additional resilient
end of said housing and said frame halves, and additional
said housing for absorbing vibration incident the move
ment of said reciprocating member.
8,023,628
7. In an impact tool, a housing including a powered
shaft turning within said housing, a pair of frame halves
supported within said housing in confronting relationship,
a shaft in one frame half arranged co-axially with a shaft
in the other frame half, a driving bevel gear mounted on 5
said powered shaft and driven bevel gears coacting there
with mounted on said shafts supported within said frame
halves, inner frame halves having extensions therefrom
for supporting said last named shafts, an eccentric mount
ed on each of said last named shafts, a reciprocating mem 10
ber including a yoke thereon surrounding said eccentrics
and adapted to be driven reciprocatingly by said eccentrics,
resilient means biased between said reciprocating member
and said inner frame halves for maintaining said eccen
trics in contact with said reciprocating member, resilient 15
means biased between one end of said housing and said
inner frame halves, and additional resilient means posi
6
tioned between said ?rst named frame halves and said
housing for absorbing vibration incident the movement of
said reciprocating member.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,015,732
1,040,424
2,453,136
2,458,929
2,724,573
2,764,188
Grice _______________ __ Jan. 23,
Salt __________________ __ Oct. 8,
Karweit ______________ __ Nov. 9,
Clark ________________ __ Jan. 11,
Lundquist ____________ __ Nov. 22,
Hoffman ____________ __ Sept. 25,
1912
1912
1948
1949
1955
1956
2,780,106
2,794,621
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Lovequist _____________ __ Feb.
Beeson _______________ __ June
Schmitz ______________ __ May
Ondeck ______________ __ Dec.
1957
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1959
1959
5,
4,
5,
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